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LEE & HARDENBERGH Hot Air Furnace; No. 96,328. Pafented Nov. 2, 1869.,

MPEYERS, FHOTO-UTHOGRAPNER, W-HDNGTDN, D C.

that same @3121 (twin-2.

WILIIIAM H. LEE AND CHARLES M. HARDEI BERGH, OF MINNEAPOLIS,

. I MINNESOTA.

Letters Patent No. 96,328, dated November 2, 1869.

HOT-AIR FURNACE.-

The Schedule referred to in these Letters Patent and making part of thesame.

Be it known that we, WILLIAM H.- Lee and Cnsnnns M. HARDENBERGH, both ofMinneapolis, in the county of Hennepin, and State of Minnesota, haveinvented certain Improvements in the Construction of Furnaces and Fluesfor Warming Buildings; and we hereby declare the following to be a fulland sufficient description thereof, reference being had to theaccompanying drawings, making part of the description, of which- &Figure1 is a perspective view of the furnace, fines,

Figure 2 is a front elevation.

Figure 3 is a rear elevation, with back or cover of chamber K removed,to show the curved diaphragm N. Figure 4 is a transverse section offurnace and fines showing a side view of furnace.

A represents cylindrical fire-box.

B is door for firing up. I

' O is a grate for the furnace.

D is an outlet from fire-box to cylinder K.

E is a damper used for starting fire.

1*, lower series of radiating-fines.

G, smoke-box for check-draught. v

H, slide-valves for the check-draught.

I, upper series of radiating-fines.

J, converging radiator, receiving smoke from K, and converging to front.

K, cylindrical chamber.

N, diaphragm, to divert flame to the side radiators.

O, ash-door and pit.

P, opening, to reach fine-chamber K, for clearing J, or taking off partof the smoke elsewhere.

a a, flanges on casting, to bring all the wroughtiron parts snuglytogether.

1), songs, to secure plates H and their attachments in place.

S, legs or standards for the furnace.

t, lugs, for sustaining. grate O.

1, 2, 3, and 4, lateral fines of lower series F.

5 is the middle fine of lower series.

6, 7, 8, and 9, lateral flues of upper series I.

10 and 11, middle upper fines of series I.

Screw-bolts for tightening up, not shown in the drawings.

To enable others skilled in the art tomake and use our improvement, wegive the following description of it.

The nature of the invention consists in the adapta tion of severalindividual devices for special purposes.

Thus, in using a series of many fines, it is not easy to control anddistribute the flame and hot air equably. This we have done by theinterposition of a diaphragm, n n, fig. 3, which throws the flame andhot air to the side fines, and equalizes the distribution of the heat,and a check-valve or draught in smoke-box G, which controls the heatthus distributed, by letting in air through slide-valve H, which slowscombustion, and. economizes fuel.

Another feature of the invention relates to the construction of theheads or ends of the cylindrical portions, in such manner, in onecasting, with uniforni flanges, that all the parts come together atonce, and make a smoke-tight joint, by screw-bolts and rods.

The general construction of the furnace is of cast and wrought-iron. Itconsists of a large cylinder, A, containing the fire, and a cylinder, K,of like diameter, but shallow, as indicated in fig. 1, to receive theproducts of combustion from the lower range of fines F, and deliver thesame to upper range of fines I, through smoke-box G, and. finally to theconvergingfiue J, and thence to the chimney.

Operation.

The fire'is lighted at B in cylinder A,.figs 4 and 3,

out), and when ignited, damper E is closed, and the products ofcombustion follow the course of the arrows, traversing the length of thefurnace four times. The distributer N renders a valuable service,compelling the flame and gases to pass through the lateral fines to alarge extent, and thus equalizes the heat throughout the apparatus.

The above-desc1ibed cylinders, tubes, &o., should be enclosed or encasedin brick-work, metal, or other suitable material.

Having stated the nature of the invention, and the mode of using it, a v

What we claim, and desire to secure by Letters Patent, is-

' cast-iron in a single casting, with flanges'a a a upon each figure,and to receive at once cylinders and fines F I J, the whole drawntogether smoke-tight.

WM. H. LEE.

CHAS. M. HARDENBERGH. Witnesses: J. K. Ronenns,

SAML. B. CONDREY.

